33797 Datasheet, PDF (11/34 Pages) Freescale Semiconductor, Inc – Four Channel Squib Driver IC

ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. Static Electrical Characteristics (continued)
Characteristics noted under conditions 4.75 V ≤ V_DD ≤ 5.25 V; 7.0 V ≤ V_{VFIRE_XX} ≤ 35 V; V_{VDIAG_X} = V_{VFIRE_XX}; FEN 1 = FEN 2
= V_DD; R_{R_LIMIT_X} = 10 kΩ ±1%, R_{R_DIAG} = 10 kΩ ±1%, -40°C ≤ T_A ≤ +85°C, GND = 0 unless otherwise noted. Typical values
noted reflect the approximate parameter means at T_A = 25°C under nominal conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
R_HS Short Threshold
R_HSS
2.8
–
4.1
κΩ
VFIRE_XA & VFIRE_XB Current during High Side Safing Test at Open
Threshold
VFIRE_1A & VFIRE_1B or VFIRE_2A & VFIRE_2B
I_1HSO
µA
270
360
410
VFIRE_XA & VFIRE_XB Current during High Side Safing Test at Short
Threshold
VFIRE_1A & VFIRE_1B or VFIRE_2A & VFIRE_2B
I_1HSS
µA
287
385
436
HIGH-SIDE SAFING SENSOR DIAGNOSTICS WITH 1 SAFING SENSOR IN FIRING PATH CONNECTED TO VFIRE_1A AND VFIRE_2A
PINS (GUARANTEED BY DESIGN) ($C0 COMMAND)
Total VFIRE_XX Current during High Side Safing Test at Open Threshold
VFIRE_1A, VFIRE_1B, VFIRE_2A & VFIRE_2B pins
I_2HSO
µA
574
705
835
Total VFIRE_XX Current during High Side Safing Test at Short Threshold
VFIRE_1A, VFIRE_1B, VFIRE_2A & VFIRE_2B pins
I_2HSS
µA
605
748
892
R_HS Valid Resistor Range
15 V ≤ V_{VDIAG_X} ≤ 35 V
R_2HS
kΩ
1.99
–
2.93
R_HS Open Threshold
15 V ≤ V_{VDIAG_X} ≤ 35 V
R_2HSO
2.93
3.35
kΩ
4.43
R_HS Short Threshold
15 V ≤ V_{VDIAG_X} ≤ 35 V
R_2HSS
kΩ
1.41
1.61
1.99
R_LIMIT RESISTOR DIAGNOSTICS ($C8 COMMAND)
R_LIMIT Valid Resistor Range
R_LIMIT Open Threshold (“Out of Range Threshold”)
R_LIMIT Short-to-Ground Threshold (“Out of Range Threshold”)
Maximum External Capacitance to Ground
R_DIAG RESISTOR DIAGNOSTICS ($C8 COMMAND) ⁽¹⁷⁾
R_RL
R_RLO
R_RLS
C_RL
4.32
60
3.0
–
–
45.3
kΩ
76
105
kΩ
3.5
4.31
kΩ
–
20
pF
R_DIAG Valid Resistor Range
R_RD
8.0
–
13
kΩ
R_DIAG Open Threshold (“Out of Range Threshold”)
R_RDO
13
23
60
kΩ
R_DIAG Short-to-Ground Threshold (“Out of Range Threshold”)
R_RDS
3.0
5.4
8.0
kΩ
Maximum External Capacitance to Ground
C_RD
–
–
20
pF
Notes
17 By changing the R_DIAG resistor value, the resistance thresholds can be varied by a linear relationship.The R_DIAG resistance could
be changed by ±10% to shift the thresholds by ±10%. Design goal for resistance threshold change is ±15%. R_DIAG threshold limit may
have to be changed to accommodate ±15% change. Example: Shifting the R_DIAG resistance value ±10%, the resistance threshold
will change by ±10%. Refer to Table 4.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33797
11